--match option doesn't work

How to reproduce:

$ bzr branch lp:casper
$ cd casper
$ bzr log --match-bugs 1065827

Expected result:

- The log entry for the commit that fixes bug 1065827.

Actual result:

bzr: ERROR: exceptions.TypeError: expected string or buffer

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1121, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1138, in ignore_pipe
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 2893, in run
    Logger(b, rqst).show(lf)
  File "/usr/lib/python2.7/dist-packages/bzrlib/log.py", line 382, in show
    self._show_body(lf)
  File "/usr/lib/python2.7/dist-packages/bzrlib/log.py", line 411, in _show_body
    for lr in generator.iter_log_revisions():
  File "/usr/lib/python2.7/dist-packages/bzrlib/log.py", line 451, in iter_log_revisions
    for revs in revision_iterator:
  File "/usr/lib/python2.7/dist-packages/bzrlib/log.py", line 872, in _filter_re
    new_revs = [rev for rev in revs if _match_filter(searchRE, rev[1])]
  File "/usr/lib/python2.7/dist-packages/bzrlib/log.py", line 886, in _match_filter
    if k in strings and not _match_any_filter(strings[k], v):
  File "/usr/lib/python2.7/dist-packages/bzrlib/log.py", line 891, in _match_any_filter
    return any([filter(None, map(re.search, strings)) for re in res])
TypeError: expected string or buffer

bzr 2.6.0dev3 on python 2.7.4 (Linux-3.8.0-19-generic-x86_64-with-
    Ubuntu-13.04-raring)
arguments: ['/usr/bin/bzr', 'log', '--match-bugs', '1065827']
plugins: bash_completion[2.6.0dev3], changelog_merge[2.6.0dev3],
    fastimport[0.13.0], gnulog[unknown], grep[2.6.0dev3],
    launchpad[2.6.0dev3], netrc_credential_store[2.6.0dev3],
    news_merge[2.6.0dev3], po_merge[2.6.0dev3], qbzr[0.23.0],
    weave_fmt[2.6.0dev3]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'en_CA.UTF-8'

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: bzr 2.6.0~bzr6571-4ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Wed May 8 17:14:20 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-04-25 (13 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: bzr
UpgradeStatus: No upgrade log present (probably fresh install)